Telephone system



v 2 Sheets-Sheet 1. G. H. HASKINS.

EE'LEPHONE SYSTEM.

'(No Model.)

Patented June 3; 1884...

; Inventm;

2 Sheets-Sheet 2.

(No Model.)

'0. HHASKINS. TELEPHONE $YSTEM.

Pat'erited June 3,1884.

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UNlTED STATES PATENT- Crrrcn.

CHARLES H. HASKINS, OF MILI/VAUKEE, WISCONSIN, ASSIGNOR TO THE IVESTERN ELECTRIC COMPANY, OF CHICAGO, ILLINOIS.

TELEPHONE SYSTEM.

SPECIFICATION forming part of Letters Patent No. 299,926, dated June 3, 1884.

Application filc-d June 524, 1881.

T 0 all whom it may concern:

Be it known that 1, CHARLES H. HASKINS, of Milwaukee, in the county of Milwaukee, and'in the State of \Visconsin, have invented certain new and useful Improvements in Telephone Systems; and I do hereby declare that the following is a full, clear, and exact description thereof.

Myinvention relates to telephonic-exchange signal systems; and it consists in the combination, with such a system, of a pole-changer or equivalent mechanism, by which the signal is operated continuously, when once actuated, until the connection with the pole-changer is broken. i

Prior to my invention the signal (usually a bell) of a telephone was generally actuated by a hand magnetogenerator. The operator was compelled to turn the handle of this generator until he received an answer to his call. In communicating to the central office, the labor of actuating the generator was annoying, and the confusion at the central office was some times. great. By the substitution of a polechanger for the hand magneto-generators of the central office, it only becomes necessary to throw the pole-changer into circuit with the signal or bell, when the signal will sound continuously until the circuit through the polechanger is broken. It is not material to the purposes of my invention what form of polechanger is used. I will proceed to describe one form of pole-changer which may be used; but my invention is not limited to that form, but embraces the combination of that or any other form of pole-changer with the switchboard of a telephonic exchange at the central office and with the signal-bells, when by the operation of the pole-changer the sounding of the bells is made continuous.

In the drawings, Figure 1 is a perspective view of a pole-changer; and Fig. 2 is a diagram of a switch-board and attachments, intended to illustrate the relation of the polechanger to the switchboard and the signaling apparatus.

In the pole-changer illustrated in Fig. 1, P is a lever, having attached to its free end two horizontal flat springs,E F. These springs are (No model.)

connected with the terminal wires of abattery or other source of electricity, M B, through "binding-posts B S, and are insulated from the lever P and from each other by a rubber plate, 6. The leverP carries an armature, p, for the electro-magnet M M, which gets its current from a local battery, L B. The current from this battery, entering at post T, traverses a wire under the base of the apparatus, and up wire tto point H, then on lever J, down wire K, back through electro-magnet M M, and by post N to local battery L B, thus completing the circuit. The free end of lever P plays between the forked ends of lever J, and when the current from the local battery traverses the circuit as above shown, lever P will be drawn by the action of the electro-magnets on its armature, until its point, pressing upon the lower arm of'the forked lever J, will raise the outer end of this lever from contact with the point H, thus breaking the local circuit. The electro-magnets M M now fail to attract the armature p, and the tension of spring V upon the arm P of lever P, will again raise its free end, which, by pressure on the upper fork of lever J will depress its front end until it makes contact at point H, when the completion of the circuit will again excite the magnets M M, and the force of the spring will be overcome. Thus by alternate impulses the lever P will be kept in rapid vibration. The spring E extends from the lever P, so that it isbetween two points, A and C, and the spring F extends between two other points, B and D. The points A and D are in circuit, and so are B and C. When lever P is raised, it carries spring E into contact with point 13. Hence, if Bis wired to ground-post X, and A is wired to line-post IV, spring E being wired to positive pole of main battery M B, and spring F to its negative pole, the raising of lever P will c011- duct a positive current to line. A reverse movement of lever P will convey a negative current to line through spring F and its connections. Thus the current flowing to the line will be reversed with every vibration of the lever P.

Fig. 2 is a diagram showing the relation of the pole-changer to the switch-board of a telephonic-exchange system, it being understood that the pole-changer hereinbcfore described, or any similar pole-changer which causes a constant reversal of currents, may be used. The switch-board l at the central office is connected by wire 2 to the pole-changer, so that battery B is connected to the switch-board through said polechangcr. Now, suppose the subscriber on linelt) Wishes to communicate with the subscriber on line 15. H 0 will. call the operator at the central ollice. This opcrator, instead of grinding out a call by a hand magneto niaehine over line 15 to the signalbells 3 of the instrument on line 15,Will insert the pin 1 in the switch-board, so as to connect line 15 with the pole-changcr. The signal on line 15 will be sounded by the reversal of currents from or through the pole-changer, as long as the pin 4- remains in this position. thus relieving the operator at the central oilice of the labor of sounding the signal by means of thehand magneto-maehine,and insuring a sig nal of sufficient duration on the subscribers line to attract attention should any person be Within hearing.

Any ordinary form of switch-board may be used with my apparatus. So with the signal,

which is usually a bell, and the principle of operation of said bell is substantially that described in English Patent No. 2,462 of 1860; but said English Patent shows or describes no connection between said signal and atelephone or switch-board.

The appliances for connecting the subscribers lines are those usual in telephonic sys tems.

\Vhat I claim is In a telephone system, and in combination with the central-ollicc switch-board thereof, a pole-changer adapted for continuous opera tion, bells adapted to be operated by reversed electric currents, electric circuits connecting said bells with the switchboard, and means for connecting the pole-changer to any line centering in said switch-board, substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this 17th day of June, 1881.

OH. H. HASKINS.

lVitnesscs:

S. STOU ANGUS S. lIIllBARD. 

